from braces.views import FormValidMessageMixin, MessageMixin, SetHeadlineMixin
from constance import config
from core.utils import EmailConfirmation
from django.core.mail import send_mail
from django.shortcuts import redirect
from django.template import loader
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.views.generic import CreateView, View
from favorites.models import Issue
from ratelimit.decorators import ratelimit

from .forms import SubscriptionForm


# Todo
# 1. 邮件改异步发送
# 2. 订阅接口限流
# 3. 邮件推送订阅内容
# 4. 引入 sortableadmin2
@method_decorator(ratelimit(key="ip", rate="3/h", method="POST"), name="post")
class SubscriptionCreateView(SetHeadlineMixin, FormValidMessageMixin, CreateView):
    form_class = SubscriptionForm
    template_name = "newsletters/subscription.html"
    form_valid_message = "感谢订阅每周精选收藏，确认邮件已发至您的订阅邮箱，请及时前往确认。如长时间没有收到确认邮件，请尝试重新订阅或联系博主。"
    headline = "订阅每周精选收藏"

    def form_valid(self, form):
        response = super().form_valid(form)
        confirmation = EmailConfirmation(instance=self.object)
        subject = config.NEWSLETTERS_SUBSCRIPTION_CONFIRMATION_SUBJECT
        html_message = loader.render_to_string(
            "newsletters/subscription_confirmation_email.html",
            context={
                "link": self.request.build_absolute_uri(
                    reverse(
                        "newsletters:subscription-confirm",
                        kwargs={"key": confirmation.make_key()},
                    )
                ),
            },
        )
        # Todo: 异步任务发送
        send_mail(
            subject=subject,
            message=html_message,
            html_message=html_message,
            from_email=None,
            recipient_list=[self.object.email],
        )
        return response

    def get_form_kwargs(self):
        kwargs = super().get_form_kwargs()
        kwargs["user"] = self.request.user
        return kwargs

    def get_success_url(self):
        return reverse("newsletters:subscription")

    def get_context_data(self, **kwargs):
        issue = Issue.objects.all().order_by("-number").first()
        favorite_list = (
            issue.favorites.all().order_by("rank", "-created_at") if issue else []
        )
        context = super().get_context_data(**kwargs)
        context.update({"issue": issue, "favorite_list": favorite_list})
        return context


class SubscriptionConfirmView(MessageMixin, View):
    def get(self, request, *args, **kwargs):
        confirmation = EmailConfirmation.from_key(self.kwargs["key"])
        if confirmation is None:
            self.messages.error("订阅链接已失效，请重新订阅。", extra_tags="danger")
            return redirect("newsletters:subscription")

        if confirmation.instance.confirmed:
            self.messages.warning("订阅邮箱已确认，无需重复确认。")
        else:
            confirmation.instance.confirm()
            self.messages.success("订阅成功！")
        return redirect("favorites:issue_list")
